Ministry of Health announces escalation of the virus, mainly in SP, RJ and MG. But it reinforces that, so far, no one has been infected through Aedes aegypti

The number of people affected by yellow fever continues to grow considerably. According to a new Ministry of Health report , 353 cases were confirmed from July 1, 2017 to February 6, 2018, with 98 deaths so far.

This represents an increase of 17 deaths and 140 episodes compared to last week’s bulletin. São Paulo (161 confirmed cases and 41 deaths), Rio de Janeiro(34 cases and 12 deaths) and Minas Gerais (157 cases and 44 deaths) are the most affected states.

Of these, only Minas does not carry out a campaign with the fractional version of the vaccine . This is because the current stock would already be sufficient for the population even at standard doses.

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It should be noted that from July 1, 2016 to February 6, 2017, Brazil faced an outbreak of more intense yellow fever. In that period, 509 cases were confirmed and 159 deaths.

What is worrying in the current outbreak is the fact that the disease is close to large urban centers, such as the states of São Paulo and Rio de Janeiro. If by chance the virus began to be transmitted by the mosquito Aedes aegypti , endemic in Brazil, the number of infected would explode exponentially.

This is called urban yellow fever – which has not yet occurred. For the time being, all confirmed infections were caused by mosquito bites Sabethes and Haemagogus , which are limited to forest regions.

The case of yellow fever in São Bernardo do Campo (SP)

Some media reported that the municipality of São Bernardo do Campo, in Greater São Paulo, had registered the first case of urban yellow fever in the country since 1942. But the story is not quite like that.

According to the city hall, the man of 35 years with the disease represents the first autochthonous case of the city – in other words, the individual was infected there and not on a trip. But that does not mean it was the Aedes that transmitted the virus.

In a note, the Ministry of Health notes: “The patient lives in the urban area, and possibly works in the rural area. Any statement before the conclusion of the work is hasty. ” More than that, the portfolio says that the risk of suffering again from the urban yellow fever is “very low.”

Because? Here are the reasons:

• All case investigations conducted to date indicate exposure to forest area 
• In all sites with human infections, there were also in monkeys 
• Mosquito surveillance has so far not found the presence of yellow fever virus in mosquitoes of the genus Aedes

In addition, the ministry argues that the levels of Aedes infestation are below what would be necessary to spread this disease in large urban centers. And it ends by stating that the areas of recommendation of the vaccine are reaching good adherence rates – although specifically that of São Bernardo do Campo would leave at least before this case.

Coordinator of Disease Control of the Health Secretariat of São Paulo , Marcos Boulos even ruled out any possibility of this episode in São Bernardo do Campo being transmitted by Aedes aegypti. According to him, when the urban yellow fever gives the faces, it does not come in isolated cases, but with a large increase of infections.

The parallel made by Boulos is with dengue, zika and chikungunya, which are already known by the Aedes. Only in 2017 (a year with far fewer cases than in 2016), dengue fever reached 252,000 Brazilians.

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